高温燃料电池阳极尾气的燃烧特性

王宝军^1,2，李国祥^1*

1.山东大学核科学与能源动力学院，山东 济南  250061；2.潍柴动力股份有限公司，山东 潍坊  261061

摘要：为准确分析高温燃料电池阳极尾气的燃烧特性，利用化学反应动力学软件Chemkin建立三参数模型；根据高温燃料电池阳极尾气的组分特点，基于合成气的化学反应动力学机理，仿真研究预热温度、燃料含氢量、燃料转化率和反应选择性对预混火焰传播速度和点火延迟时间的影响。仿真结果表明：预热温度对点火延迟时间的影响较大，预热温度降低100 K，点火延迟时间呈指数增长；气体组分对火焰传播速度的影响大于对点火延迟时间的影响；反应转化率越大，层流火焰传播速度越小，点火延迟期越长；随着反应选择性正向移动，燃料中H₂组分减少，火焰传播速度增大，点火延迟期减小。

关键词：低热值阳极尾气；预热；火焰传播速度；点火延迟

Burning characteristics of anode off gas from high temperature fuel cell

WANG Baojun^1,2, LI Guoxiang^1*

1.School of Nuclear Science, Energy and Power Engineering, Shandong University, Jinan 250061, China;

2.Weichai Power Co., Ltd., Weifang 261061, China

Abstract: To accurately analyze the burning characteristics of the anode off gas from high temperature fuel cells, a three-parameter model is developed using Chemkin, the chemical reaction dynamics software. The effects of pre-heating temperature, hydrogen content, fuel conversion rate, and reaction selectivity on the premixed flame spread velocity and ignition delay time are simulated, basing on the dynamics of chemical reaction of synthetic gases and component characteristics of the anode off gas from high temperature fuel cell. The simulation results show that the pre-heating temperature has a greater impact on the ignition delay time, the pre-heating temperature is reduced by 100 K, the ignition delay time is increased exponentially. The gas component has a greater impact on the flame spread velocity than on the ignition delay time. Gas components have a greater impact on the flame spread velocity than on the ignition delay time. The higher the reaction conversion rate is, the lower the laminar flame spread velocity is, the longer the ignition delay time is. As the reaction selectively moves forward, the hydrogen content in the fuel decreases, flame spread velocity increases, and the ignition delay time decreases.

Keywords: low heat value anode off gas; pre-heating; flame spread velocity; ignition delay time